Lesson Preview

Teach Magnetic Fields & Lorentz Force
with The Electric Shocktopus

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Theory

Magnetic Fields and Lorentz Force

Learn what these terms mean and continue playing the Electric Shocktopus!

Teacher Resources

This lesson reviews the concept of electric charges and teaches the students about magnetic fields and Lorentz force.

  • Theory: This lesson introduces your students to the concepts of magnetic fields and Lorentz force.
  • Play: Students get to continue playing the Electric Shocktopus.
  • Share & Discuss: These tasks focus on understanding both magnetic fields and Lorentz force.

Review: Electric Charges

  • There are two types of electric charges. What are they?
Show Notes

Positive and negative charges.

  • How do electric charges react to one another?
Show Notes

Similar charges repel one another. Different charges (+/-) attract one another.

  • A charge is one type of electricity. What is the other type and what is the difference?
Show Notes

A charge is a stationary kind of electricity. The other is a current, which is a mobile, moving kind of electricity.

Electric charge.

Teacher Resources

You can give the students a few minutes to think about these answers, but they won’t likely need a long time because these questions aren’t all that challenging.

Image Source: Electric Charge, Wikimedia Commons.

Magnetic Fields

  • A region around a magnetic material or a moving electric charge within which the force of magnetism acts
  • A magnetic field is generated when electric charge carriers such as electrons move through space or within an electrical conductor (source)
  • Properties of a magnetic field are rendered in electromagnetism, which is the basis of technological advancements such as bullet trains, elevators, escalators and cathode-ray tube televisions (source)

Magnetic fields.

Teacher Resources

Use your own sources and the ones below to teach the concept of magnetic fields to the students.

READ:

WATCH:

Lorentz Force

  • Lorentz force, the force exerted on a charged particle q moving with velocity v through an electric E and magnetic field B. The entire electromagnetic force F on the charged particle is called the Lorentz force (after the Dutch physicist Hendrik A. Lorentz) and is given by
    F = qE + _qv × B.
    (source)

Hendrik A. Lorentz.

Teacher Resources

This concept probably seems much more intimidating to students than it actually is. It can be a good idea to illustrate this concept with a few exercises that you can solve together.

Reminder: As taught in the previous lesson, an electric field is “a region around a charged particle or object within which a force would be exerted on other charged particles or objects.”

READ:

WATCH:

Image Source: Hendrik A. Lorentz, Wikimedia Commons

Play

Lesson Goal

Now is time to play the game! Optional challenge: Earn 3 stars in as many levels as you can.

CONTROLS Movement - arrow keys / WASD
Activate charge - shift / Z
Restart level - R
Menu - ESC

Pay attention to -
magnetic fields
Lorentz force

Gameplay screenshot.

Teacher Resources

Leave this slide open while playing, and move on to the next phase when there is about 10 minutes remaining.

The “Pay attention to” segment includes topics that will be discussed in the tasks at the end of the lesson.

If some students are having trouble playing the game, be sure to help them. You should, however, leave them with a chance to try in earnest before giving them any solutions.

Share & Discuss

Share & Discuss

  • How far along did you get?
  • Did you get 3 stars in a level? How many times did you manage to get 3 stars?
  • Did you need to skip a level? If so, what made it difficult?

Teacher Resources

These questions are meant to get the students to open up and start a discussion. The answers do not matter as much as the fact that they are talking: the next slide provides opportunities for evaluation and should be more strictly observed.

Tasks after Playing

What is a magnetic field? What creates a magnetic field?

Show Notes

What is a magnetic field: A region around a magnetic material or a moving electric charge within which the force of magnetism acts.
What creates a magnetic field: A magnetic field is generated when electric charge carriers such as electrons move through space or within an electrical conductor.

This is the equation for Lorentz force:\

F = qE + qv × B
What does each letter stand for? What is the Lorentz force?

Show Notes

Key to the equation: q = particle, F = force (the titular Lorentz force), E = electric field, B = magnetic field, v = velocity of the particle
What is the Lorentz force: The force exerted on a charged particle q moving with velocity v through an electric E and magnetic field B. The entire electromagnetic force F on the charged particle is called the Lorentz force.

Teacher Resources

It’s a good idea to let the students think about these answers for a moment before asking them - if you so wish, they can even check the game for the answers if necessary! Below are the expected answers for these questions. If you have time, you can demonstrate the answers in the game itself.

You can also let the students know what the topic of the next lesson is: conductors and insulators!